Support for Adaptive Handle Orientation

ui/touch_selection/touch_handle.h

Index: ui/touch_selection/touch_handle.h
diff --git a/ui/touch_selection/touch_handle.h b/ui/touch_selection/touch_handle.h
index f46a07fd761e2ee34b5dde89632cc42364e0746f..4b474c2412f9cb4e3e0ce5c22d50a29acff38192 100644
--- a/ui/touch_selection/touch_handle.h
+++ b/ui/touch_selection/touch_handle.h
@@ -24,9 +24,12 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandleDrawable {
  public:
   virtual ~TouchHandleDrawable() {}
   virtual void SetEnabled(bool enabled) = 0;
-  virtual void SetOrientation(TouchHandleOrientation orientation) = 0;
+  virtual void SetLayout(const gfx::PointF& position,
+                         ui::TouchHandleOrientation orientation,
+                         bool mirror_vertical,
+                         bool mirror_horizontal,
+                         bool mirror_changed) = 0;
   virtual void SetAlpha(float alpha) = 0;
-  virtual void SetFocus(const gfx::PointF& position) = 0;
   virtual gfx::RectF GetVisibleBounds() const = 0;
 };
 
@@ -51,7 +54,9 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandleClient {
 class UI_TOUCH_SELECTION_EXPORT TouchHandle {
  public:
   // The drawable will be enabled but invisible until otherwise specified.
-  TouchHandle(TouchHandleClient* client, TouchHandleOrientation orientation);
+  TouchHandle(TouchHandleClient* client,
+              TouchHandleOrientation orientation,
+              const gfx::RectF viewport_rect);
   ~TouchHandle();
 
   // Sets whether the handle is active, allowing resource cleanup if necessary.
@@ -66,10 +71,14 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   // If an animation is in-progress, it will be overriden appropriately.
   void SetVisible(bool visible, AnimationStyle animation_style);
 
-  // Update the handle placement to |position|.
+  // Update the focus points for the handles. The Handle will be positioned
+  // either |top| or |bottom| based on the mirror parameters.
   // Note: If a fade out animation is active or the handle is invisible, the
   // handle position will not be updated until the handle regains visibility.
-  void SetPosition(const gfx::PointF& position);
+  void SetFocus(const gfx::PointF& top, const gfx::PointF& bottom);
+
+  // Update the Viewport rect, based on which the handle decide its inversion
+  void SetViewportRect(const gfx::RectF viewport_rect);
 
   // Update the handle visuals to |orientation|.
   // Note: If the handle is being dragged, the orientation change will be
@@ -90,10 +99,11 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   gfx::RectF GetVisibleBounds() const;
 
   bool is_dragging() const { return is_dragging_; }
-  const gfx::PointF& position() const { return position_; }
+  const gfx::PointF& focus_bottom() const { return focus_bottom_; }
   TouchHandleOrientation orientation() const { return orientation_; }
 
  private:
+  void UpdateLayout();
   void BeginDrag();
   void EndDrag();
   void BeginFade();
@@ -104,7 +114,9 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
 
   TouchHandleClient* const client_;
 
-  gfx::PointF position_;
+  gfx::PointF focus_bottom_;
+  gfx::PointF focus_top_;
+  gfx::RectF viewport_rect_;
   TouchHandleOrientation orientation_;
   TouchHandleOrientation deferred_orientation_;
 
@@ -125,6 +137,10 @@ class UI_TOUCH_SELECTION_EXPORT TouchHandle {
   bool is_dragging_;
   bool is_drag_within_tap_region_;
 
+  // Mirror variables determine if the handles should be inverted or not.
+  bool mirror_vertical_;
+  bool mirror_horizontal_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchHandle);
 };